# Register the Regolith public key to your local apt
wget -qO - https://archive.regolith-desktop.com/regolith.key | sudo apt-key add -

# Add the repository URL to your local apt
echo deb "[arch=amd64] https://archive.regolith-desktop.com/ubuntu/stable focal v3.1" | \
sudo tee /etc/apt/sources.list.d/regolith.list

# Update apt
sudo apt update
echo Regolith Desktop can be installed by executing: sudo apt install regolith-desktop regolith-session-flashback regolith-look-lascaille